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Case Reports in Pathology
Volume 2016, Article ID 4182026, 4 pages
Case Report

Solitary Fibrous Tumor of the Sigmoid Colon Masquerading as an Adnexal Neoplasm

1Department of Surgical Pathology, University of Rochester Medical Center, 601 Elmwood Avenue, Box 626, Rochester, NY 14642, USA
2Department of Colorectal Surgery, University of Rochester Medical Center, 601 Elmwood Avenue, Rochester, NY 14642, USA
3Department of Pathology, NYU Langone Medical Center, 550 1st Ave, Suite TH388, New York, NY 10016, USA

Received 27 May 2016; Accepted 23 August 2016

Academic Editor: Mark Li-cheng Wu

Copyright © 2016 Laura Bratton et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Solitary fibrous tumor is a rare, benign spindle cell neoplasm that was first described in the thoracic pleura. This tumor is now known to occur at many extrapleural sites. There are established criteria for the diagnosis of malignant solitary fibrous tumor including ≥4 mitotic figures per 10 high-power fields, increased cellularity, cytologic atypia, infiltrative margins, and/or necrosis. Although all solitary fibrous tumors have the potential to recur or metastasize, those with malignant histologic features tend to behave more aggressively. We report a case of solitary fibrous tumor, with malignant histologic features, in a 21-year-old woman which arose from the serosal surface of the sigmoid colon.